Lepton Collider

• Increased interest in high energy e+e- collider (Japan, CERN, China)

• STFC funded us for £75k/year travel money in 2015 and 2016 to re-engage with international LC community

• Outlined three aspects• Silicon tracking (ex. LCFI, etc.)• DAQ (ex. Calice, EUDET, AIDA)• Calorimetry (ex. Calice) Birmingham

Nigel Watson / Birmingham30-Sep-2015

Lepton Collider R&D - DECAL Concept, CALICE

• Concept, swap ~0.5x0.5 cm2 Si pads with small pixels (“Small” := at most one particle/pixel,1-bit ADC/pixel)

• How small to avoid saturation/non-linearity?

• EM shower core density at 500GeV is ~100/mm2

• Pixels must be<100100m2

• Used baseline 5050m2

• Gives ~1012 pixels for ECAL – “Tera-pixel APS”

• Mandatory to integrate electronics on sensor

• Concept, swap ~0.5x0.5 cm2 Si pads with small pixels (“Small” := at most one particle/pixel,1-bit ADC/pixel)

• How small to avoid saturation/non-linearity?

• EM shower core density at 500GeV is ~100/mm2

• Pixels must be<100100m2

• Used baseline 5050m2

• Gives ~1012 pixels for ECAL – “Tera-pixel APS”

• Mandatory to integrate electronics on sensor

AECAL DECAL Npixels=Nparticles

DECAL Npixels<Nparticles30-Sep-2015 Nigel Watson / Birmingham

MAPS, MIP Efficiency

Project tracks to individual test sensors

Check for sensor hits as function of track (x,y) position relative to pixel centre

Determine efficiency by fitting distribution

scintillators 2 TPAC test sensors

4 TPAC track sensors Efficiency for 4 sensor variants, from

CERN (Aug.’09, 120 GeV ) and DESY (Mar.’10, 1-5 GeV e-) testbeams

Standard CMOS sensors have low efficiency due to signal absorption by circuit elements

Deep p-well (INMAPS) reduces signal absorption, raises efficiency by factor ~5

(12m) high-resistivity epitaxial layer raises efficiency by further factor ~x2

30-Sep-2015 Nigel Watson / Birmingham

12m

MAPS, MIP Efficiency

Project tracks to individual test sensors

Check for sensor hits as function of track (x,y) position relative to pixel centre

Determine efficiency by fitting distribution

scintillators 2 TPAC test sensors

4 TPAC track sensors Efficiency for 4 sensor variants, from

CERN (Aug.’09, 120 GeV ) and DESY (Mar.’10, 1-5 GeV e-) testbeams

Standard CMOS sensors have low efficiency due to signal absorption by circuit elements

Deep p-well (INMAPS) reduces signal absorption, raises efficiency by factor ~5

(12m) high-resistivity epitaxial layer raises efficiency by further factor ~x2S

ingl

e pa

rtic

le e

ffic

ienc

y

Pixel threshold (arbitrary units)

30-Sep-2015 Nigel Watson / Birmingham

12m12m

MAPS, MIP Efficiency

Project tracks to individual test sensors

Check for sensor hits as function of track (x,y) position relative to pixel centre

Determine efficiency by fitting distribution

scintillators 2 TPAC test sensors

4 TPAC track sensors Efficiency for 4 sensor variants, from

CERN (Aug.’09, 120 GeV ) and DESY (Mar.’10, 1-5 GeV e-) testbeams

Standard CMOS sensors have low efficiency due to signal absorption by circuit elements

Deep p-well (INMAPS) reduces signal absorption, raises efficiency by factor ~5

(12m) high-resistivity epitaxial layer raises efficiency by further factor ~x2S

ingl

e pa

rtic

le e

ffic

ienc

y

Pixel threshold (arbitrary units)

Preliminary 2009/10 testbeam dataPreliminary 2009/10 testbeam data

30-Sep-2015 Nigel Watson / Birmingham

MAPS for DECAL, (~)Shower Profile

Project tracks to individual test sensors

Vary depth of absorber thickness, study downstream hit multiplicity

Purely to cut cost – not ideal

30-Sep-2015 Nigel Watson / Birmingham

scintillators 2 TPAC test sensors

4 TPAC track sensors

# cl

uste

rs/#

tra

cks

Absorber thickness (X0)

Study TPAC sensors as “calorimeter” layer

Peak of sensor activity vs. depth of material

Single sensor study of EM shower response

Electron beam shows expected log behaviour

(NB: single sensor transverse size)

MAPS for DECAL, (~)Shower Profile

Project tracks to individual test sensors

Vary depth of absorber thickness, study downstream hit multiplicity

Purely to cut cost – not ideal

30-Sep-2015 Nigel Watson / Birmingham

scintillators 2 TPAC test sensors

4 TPAC track sensors

Absorber thickness (X0)

Sho

wer

max

. de

pth

(X0)

Now (Bham, PPD, Sussex) using CHERWELL sensor to find show stoppers for DECAL

Power consumption ( 1% duty cycle “no harm” tests)

Pixel ganging (exploit tracker technology)

Future (-- “ --), investigating rad hard MAPS for DECAL and tracking (higher intensity hadron colliders + LC)

Incident e- energy (GeV)

Cherwell tests

Sensor on daughter boardFirmware adaptation required for power cycling

Nigel Watson / Birmingham30-Sep-2015

PRD Bid…

Let’s hope…

Nigel Watson / Birmingham30-Sep-2015